overrun vs invade

overrun is a noun but invade is not a noun.

Word	Noun	Adjective	Verb	Adverb
overrun	Yes	No	Yes	No
invade	No	No	Yes	No

As verbs, invade is a hypernym of overrun; that is, invade is a word with a broader meaning than overrun:

overrun: invade in great numbers
invade: march aggressively into another's territory by military force for the purposes of conquest and occupation

Other hypernyms of overrun include occupy.

As verbs, overrun and invade are synonyms defined as:

Other synonyms of overrun include infest.

overrun (noun)	invade (noun)
too much production or more than expected

overrun (verb)	invade (verb)
run beyond or past	march aggressively into another's territory by military force for the purposes of conquest and occupation
seize the position of and defeat	penetrate or assault, in a harmful or injurious way
flow or run over (a limit or brim)	to intrude upon, infringe, encroach on, violate
invade in great numbers	occupy in large numbers or live on a host
occupy in large numbers or live on a host